Geography crossword puzzle

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Across
  1. 4. Movement of the earth causing day and night
  2. 7. the imaginary halves of the Earth.
  3. 9. an imaginary semicircle joining two poles,used to locate any place on the globe.
  4. 10. the latitude dividing the Earth into two equal hemispheres.
Down
  1. 1. A longitude which determine average time of an area.
  2. 2. The time, calculated on the basis of longitude of a given place.
  3. 3. one area following the time of a same longitude.
  4. 5. Imaginary straight line joining the poles.
  5. 6. Movement of the Earth causes seasonal changes
  6. 8. A city on which zero degree longitude passes through.